"Create measure from time selection" - total confusion.

Dear Reapers,

Struggling here with an issue..

Situation:
Perfectly cut 2 bar audio item, perfectly aligned at the beginning of a bar.(lets say bar 9)
This audio item is in Reaper cut out of an mp3 song.

- I set time selection around this item.
- I run action "Create measure from time selection (new time signature).
I fill in 2 bars in the dialog window and apply the action.

Outcome:

The audio item has tempo markers placed at start and end of item, with the correct tempo values.
However: the audio item is moved in time, it didn't stick at the beginning of bar 9.

Now i would swear this shifting in time never happened to me when applying the create measure action.
I fiddled around with timebase settings for items and also for tempo envelope: no succes.

The only way i found out to not have the audio item shifted is to delete the very first tempo marker at the beginning of a Project (120 bpm tempo marker), before applying the create measure action.

But then again, in the past i never had to this first.

My gut says this is some kind of bug introduced in latest version of Reaper but i am not sure so i post this issue in this forum section first.

I use the create measure action alot so any help highly appreciated !

OSX 10.11.6
Reaper 5.26pre6 - 64bit.

"Create measure from time selection" - total confusion.